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In the run-up to Saturday's big fight, Floyd Mayweather has been revealing details about why he split with his ex-girlfriend and fiancee Shantel Jackson, saying it was because she had had an abortion and that he was "totally against killing babies."

(Photo: Reuters/Steve Marcus)Undefeated boxer Floyd Mayweather Jr. is seen in this file photo.

On Thursday, Mayweather posted a sonogram photo to his official Facebook, and revealed that Jackson aborted their twin babies.

The pair broke up last year, but until this week, fans did not know the real reason for their split.

However, Mayweather explained the real reason when he posted the sonogram photo and abortion papers (dated December 26).

"The real reason me and Shantel Christine Jackson @missjackson broke up was because she got a abortion, and I'm totally against killing babies. She killed our twin babies, " he captioned the photo.

Although the original post has since been deleted, it was up long enough for media outlets to jump on the news. Despite pulling the sonogram photo from his Facebook, Mayweather did not backtrack on what he had revealed.

In a recent interview with V-103, the boxer continued to talk about his ex, describing her as "selfish."

He said, "It hurt my feelings, all because she's selfish because all she's worried about is looks, talking about 'I don't want to mess my body up.' Everything you got on your body, I paid for so it's okay. Even if you had the baby — even if you had the babies, if you wanted me to put you back together like I did in the beginning, I could've done it again."

The 37-year-old and Jackson previously dated for four years before calling off their engagement last year.

Shantel Jackson, also known as Miss Jackson, is an aspiring actress and model and is now dating Nelly.